Restructure README.md (#43)

* Restructure README.md

Various changes to recommend the pipeline classes as well as improving the documentation/making things more clear.

* Smaller improvements ™️
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@ -76,38 +76,99 @@ ViaLoader provides a wrapper class with default values for that. To use a defaul
If you want to change the default value you should create your own class which extends the base class and overrides the methods you want to change. If you want to change the default value you should create your own class which extends the base class and overrides the methods you want to change.
The only default value you have to change is the ``VLLoader`` argument. The loader is used to register all the providers for the Via* platforms. The only default value you have to change is the ``VLLoader`` argument. The loader is used to register all the providers for the Via* platforms.
To override the default you first create a new class which extends ``VLLoader`` and overrides the ``load`` method (Make sure to call the super method). Providers are used to provide information about the platform to ViaVersion when it's (almost) impossible to get them ourselves.
To override the default you first create a new class which extends ``VLLoader`` and overrides the ``load`` method.
Within the ``load`` method you have to register a ``VersionProvider`` implementation which will be used to determine the target server version of a given connection. Within the ``load`` method you have to register a ``VersionProvider`` implementation which will be used to determine the target server version of a given connection.
Here is an example implementation: Here is an example implementation:
```java ```java
Via.getManager().getProviders().use(VersionProvider.class, new BaseVersionProvider() { public class CustomVLLoaderImpl extends VLLoader {
@Override @Override
public ProtocolVersion getClosestServerProtocol(UserConnection connection) { public void load() {
return ProtocolVersion.v1_8; // Change the logic here to select the target server version super.load();
Via.getManager().getProviders().use(VersionProvider.class, new BaseVersionProvider() {
@Override
public ProtocolVersion getClosestServerProtocol(UserConnection connection) {
// Change the logic here to select the target server version
return ProtocolVersion.v1_8;
}
});
} }
}); }
``` ```
Then you have to create a new instance of your loader class and pass it to the ``ViaLoader.init`` call. Then you have to create a new instance of your loader class and pass it to the ``ViaLoader.init`` call.
To do this you can call the ``ViaLoader.init()`` method somewhere suitable in your project (You can do that async) with your desired argument values: To do this you can call the ``ViaLoader.init()`` method somewhere suitable in your project (You can do that async) with your desired argument values:
```java ```java
ViaLoader.init(null/*ViaPlatform*/, new CustomVLLoaderImpl(), null/*ViaInjector*/, null/*ViaCommandHandler*/, ViaBackwardsPlatformImpl::new, ViaLegacyPlatformImpl::new, ViaAprilFoolsPlatformImpl::new); ViaLoader.init(null/*ViaPlatform*/, new CustomVLLoaderImpl(), null/*ViaInjector*/, null/*ViaCommandHandler*/, ViaBackwardsPlatformImpl::new, ViaRewindPlatforImpl::new, ViaLegacyPlatformImpl::new, ViaAprilFoolsPlatformImpl::new, ViaBedrockPlatformImpl::new);
``` ```
Make sure to have all platform impls you need added to the init call. Every platform added there needs to be in your dependencies.
After you have initialized the Via* platforms you can start implementing ViaLoader into your project. After you have initialized the Via* platforms you can start implementing ViaLoader into your project.
### Netty modifications
The most important part is the modification of your netty pipeline. This is needed for ViaVersion to translate the packets in both ways. The most important part is the modification of your netty pipeline. This is needed for ViaVersion to translate the packets in both ways.
Our recommended way is to use the `VLPipeline` (for codec based pipelines) or the `VLLegacyPipeline` (for decoder/encoder pipelines) as it
automatically handles the modifications required for all Via* platforms.
Here is an example implementation:
```java
public class CustomVLPipeline extends VLPipeline {
public ViaProxyVLPipeline(UserConnection user) {
super(user);
}
// Replace these with the names of your pipeline components
@Override
protected String compressionCodecName() {
return "compression_codec";
}
@Override
protected String packetCodecName() {
return "packet_codec";
}
@Override
protected String lengthCodecName() {
return "length_codec";
}
}
```
The same can be done for the `VLLegacyPipeline` with similar functions for the decoder/encoder pairs.
Then you can add the Via* pipeline to your netty pipeline:
```java
final UserConnection user = new UserConnectionImpl(channel, true/*clientside or serverside*/);
new ProtocolPipelineImpl(user);
channel.pipeline().addLast(new CustomVLPipeline(user));
```
Both `VLPipeline` and `VLLegacyPipeline` contain various functions allowing you to modify/wrap the existing pipeline elements,
if you need a more complex/dynamic pipeline setup you can also manually add the Via* handlers to the pipeline.
Here is an example implementation: Here is an example implementation:
```java ```java
final UserConnection user = new UserConnectionImpl(channel, true/*clientside or serverside*/); final UserConnection user = new UserConnectionImpl(channel, true/*clientside or serverside*/);
new ProtocolPipelineImpl(user); new ProtocolPipelineImpl(user);
//channel.pipeline().addBefore("packet_decoder", VLLegacyPipeline.VIA_DECODER_NAME, new ViaDecoder(user));
//channel.pipeline().addBefore("packet_encoder", VLLegacyPipeline.VIA_ENCODER_NAME, new ViaEncoder(user));
channel.pipeline().addBefore("packet_codec", VLPipeline.VIA_CODEC_NAME, new ViaCodec(user)); channel.pipeline().addBefore("packet_codec", VLPipeline.VIA_CODEC_NAME, new ViaCodec(user));
``` ```
If you are using ViaLegacy, you should read its README to see what changes you need to make to the netty pipeline for it to work. If you are using ViaLegacy, you should read its [README](https://github.com/ViaVersion/ViaLegacy?tab=readme-ov-file#vialegacy) to see what changes you need to make to the netty pipeline for it to work.
Depending on where you are implementing ViaLoader you might need to ensure that the pipeline is held in the correct order. Depending on where you are implementing ViaLoader you might need to ensure that the pipeline is held in the correct order.
Minecraft clients modify the pipeline order when adding the compression handlers. You have to ensure that the Via* handlers are always on their correct location. Minecraft clients modify the pipeline order when adding the compression handlers. You have to ensure that the Via* handlers are always on their correct location.
If you are using the `VLPipeline` or `VLLegacyPipeline` you can fire the `CompressionReorderEvent` once the compression handler is added to the pipeline.
Now you should have a working protocol translator implementation in your project. Now you should have a working protocol translator implementation in your project.
## Configuring the protocol translation ## Configuring the protocol translation